Sex Determination in Humans (Leaving Cert Biology): Flashcards
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15 cards from this deck
Total chromosomes in humans
Total chromosomes in humans
46 chromosomes in 23 pairs
Number of autosome pairs
Number of autosome pairs
22 pairs (44 chromosomes)
Number of sex chromosome pairs
Number of sex chromosome pairs
1 pair (2 chromosomes)
Names of the sex chromosomes
Names of the sex chromosomes
X and Y chromosomes
Female sex chromosome combination
Female sex chromosome combination
XX
Male sex chromosome combination
Male sex chromosome combination
XY
Larger sex chromosome
Larger sex chromosome
X chromosome
Approx. number of genes on X chromosome
Approx. number of genes on X chromosome
Approximately 1,000 genes
Number of genes on Y chromosome
Number of genes on Y chromosome
Fewer than 100 genes
Which parent determines child's sex
Which parent determines child's sex
The father/male parent
Chromosome carried by all egg cells
Chromosome carried by all egg cells
X chromosome
Chromosomes carried by sperm cells
Chromosomes carried by sperm cells
Either X or Y chromosome
When sex is determined
When sex is determined
At the moment of fertilisation
Term for males with different sex chromosomes
Term for males with different sex chromosomes
Heterogametic sex
Term for females with same sex chromosomes
Term for females with same sex chromosomes
Homogametic sex